Ninja Master is a flashy and bizarre fighter of the Leazas Coliseum. He has a rare talent to be a Ninja, which is very uncommon in The Continent since they originate from JAPAN.

He's very extravagant and unnecessary showy. He also talks in a pretty weird and slow, yet respectful manner. Despite his appearance and weirdo personality, he's a decently strong fighter since he could advance a few rounds in the Coliseum.

During the events of Rance 01, Rance mistook him for Kanami Kentou since he had only read his name in the board. He ended up being defeated by him in the Coliseum. It was later revealed that Ninja Master is just a nickname he made up and his real name is Harry Stewart. His personality is also much more calm and rational, but he uses a Personality Changing Scroll to alter it into a more flashy one to give a better impression and a better spectacle to the audience.

He is featured in the Rance 01 OVA, and makes a short appearance in a bar in Rance 03.